The recent marriage of three Harvard museums gave art lovers something to rejoice about. Now lovers can do the same under that conjoined roof at one of the area’s newest—and most in-demand—reception venues. In addition to the light-filled Calderwood Courtyard, there’s the intimate Adolphus Busch facility, built in the spirit of a grand hall with period stonework and casts of medieval and Renaissance sculptures. And in warmer months, the adjoining terrace and garden make a sweet setting too.